Definition: muridae

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Source: WordNet (r) 1.7 

Muridae
     n : originally Old World rats now distributed worldwide;
         distinguished from the Cricetidae by typically lacking
         cheek pouches [syn: Muridae, family Muridae]

Source: Webster's Revised Unabridged Dictionary (1913) 

Murine \Mu"rine\, a. [L. murinus, from mus, muris, mouse: cf. F.
   murin.] (Zo["o]l.)
   Pertaining to a family of rodents (Murid[ae]), of which the
   mouse is the type.